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Finding the Fourth Proportional to 162.40, 244.04 and 85.42

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Solution

The fourth proportional to 162.40, 244.04 and 85.42 is: 128.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.40 : 244.04 = 85.42 : x
  2. Step 2: Convert to fraction form
    162.40/244.04 = 85.42/x
  3. Step 3: Cross multiply
    162.40x = 244.04 × 85.42
  4. Step 4: Simplify right side
    162.40x = 20,845.90
  5. Step 5: Solve for x
    x = 20,845.90/162.40
  6. Step 6: Final answer
    x = 128.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.